Add new compliance standards topic to global navigation

What does this MR do and why?

With gitlab-org/gitlab!193101 (merged) merged and the new file published, let's add the new page to the global navigation.

Screenshots, screen recordings, or links to review app

Link to new page: https://docs.gitlab.com/review-mr-799/user/compliance/compliance_frameworks/compliance_standards/

Merge request acceptance checklist

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